The Zenoah 20 EI is a HORRIBLE engine.
You can figure 44 ounces for the Zenoah G20 EI and 10 pounds thrust
The RCIGN Zenoah G26 weighs basically the SAME at 46 ounces, but produces 17 pounds thrust
The ignition system on the Zenoah 20 EI uses a LOT of current, which means your battery is dead after only a few flights.
The RCIGN Zenoah 26 will fly all day on a charge, has 70 % more power, all for the SAME weight.
This one is a no brainer.
JettPilot